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1. Introduction
3003 Aluminum Honeycomb Core for Cooling Agent Carrier[Factory Wholesale Best Price Stainless Steel Forged Blind Flange].Intelligent Digital Power Meter.
Beef is considered fresh if it is recently processed,2019 Hot Sell Green Black Pink Red Custom Made Backpacks for Girls Kids Fashion Mochilas-Teflon Tape with Competitive Price, and has not undergone any treatment other than chilling to ensure preservation[OEM Foundry Casting Parts Metal Casting Die Casting Stainless Steel].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,PVC Coated Diamond Wire Mesh/Chain Link Fence/Chain Link Wire Mesh. Therefore the packaging must provide a hermetic and reliable closure,OEM Production Liquid Laundry Detergent for Clothes[Stripe Stone Mosaic Cutting Machines for Making Wall Tile].
High Quality Low Price 8m Span 3.2m Height Small Greenhouse with Single Span-tight and compact pack. The skin-Best Price Hollow Section Ms ERW Welded Black Steel Pipe for Furniture.PVC Gutter Fittings with Pipe Connector Roofing Drainage System Rainwater Down Pipe, a contour fit and neat appearance[China Suppliers Cosmetic Packaging 15ml 30ml 50ml Empty Frosted Luxury Lotion Airless Pump Bottle].
China SPA-H Corten a Corten Steel Fence Panels,Customized Gift Boxing Laser Engraved Zinc Alloy Gold Metal Medal (241), toughness and sealing characteristics, among other features[5.5 Kw Oil Free Scroll Air Pump Air Head for AC Compressor]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[UHP Graphite Electrodes with Competitive Price].
According to Zhou et al.[Patient Warming Blanket for Surgery],Igeelee HS-05wf 0.5-6.0mm2 Crimping Tools for Wire End Sleeves High Quality Multi-Function Crimping Pliers Tube Crimping Pliers-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)China Wholesale Pattern Stainless Steel Optical Frame Quality Stainless Steel Eyeglasses Frame for Men.5 mL (STP).m-2.day-1.Mesh Laundry Bags for Stocking, Underwear, Bra,Woodworking Bandsaw Sawmill/ Portable Sliding Table Panel Sawmill/High Precision Sliding Table Panel Saw Sawmill for Furniture Making, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Sun-420PP Automatic Pouch Coconut Milk Packaging MachineoC.
China Cheap Wood Chips Sawdust Pellet Machine/PVDC/PE (polyethylene) films are widely used and very effective to preserve fresh beef, they are considered not eco-friendly because they contain chlorine which produces dioxin during combustion and require controled atmospheric emissions in case they are submitted to energetic recycling after disposal. They can not be easily recycled either into polymer streams given the fact that these films are crosslinked and the PVDC has limited thermal stability.
In regards to sustainability, the impact of packaging to the environment can be minimized by following some criteria such as: (i) it has to be beneficial, safe and healthy for individuals and communities throughout its lifecycle; (ii) meet the designed performance and cost; (iii) maximize the use of renewable or recycled materials; (iv) manufactured using clean production technologies and best practices; (v) made from materials healthy in all probable end-of-life scenarios and; (vi) can be recovered effectively and used in biological and/or industrial cradle-to-cradle cycles[Hydraulic Metal Hole Digger Punching Machine (CH-80)].
To mitigate the environmental problems associated with PVDC films and to offer beef processors a more sustainable packaging alternative, multilayer coextruded films containing EVOH, PA and PE have been tested to package fresh meat products and are regarded as a valid alternative to traditional PVDC films used in wholesale distribution of chilled meat[Composite Toe Cap Summer Lightweight Safety Shoes Sc-8803].
China Manufacturer Diesel Engine 6bt Qsb Dongfeng Truck Belt Tensioner(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Ce Approved Ring Die Ball Shaper Organic Fertilizer Machine. These features are of particular interest to recycling plants as non-crosslinked materials can be more easily merged into regular recycling streams and also to film converters that do not need to operate gamma radiation units and therefore avoid high energy radiation risks in the working environment.
Besides film design, environmental conditions and specifically temperature and humidity may affect barrier properties. A possible drawback of films containing EVOH and PA is that these materials are hygroscopic and regarded to be sensitive to moisture in a way that when exposed to high moisture environment they may have limited ability to provide adequate oygen barrier[Living Room White Marble Coffee Side Table Small Size Metal Golden Frame Hexagon Shape].
According to McKeen[A182 F11 Dn25 Pn10 Weld Neck Flange for Welding]the permeability of EVOH and PA films is depending on the relative humidity.Sintered Stainless Steel Micro Bubble Diffuser% of ethylene varies from 0.01 to 0.05 mL.mm.m-2.day-1.atm-1at 20oC as the relative humidity (RH) varies from 0% to 85%, while for 20 µm thick films made of EVOH with 44 mol% of ethylene,2000L Storage Fermentation Mixing Stainless Steel Tank.04 to 0.08 mL.mm.m-2.day-1.atm-1at 20oC as RH increases from 65% to 85%. In the case of 25 µm thick films made of polyamide 66/6 copolymer the coefficient varies from 0.94 to 5.91 mL.mm.m-2.day-1.atm-1at 23oC as the RH varies from 0% to 90%.
It has been reported that multilayer PET/PVDC/PE films with layer thicknesses of 12/4/Steel Jacket Steam Insulation Pipeline Production Best Price.m-2.day-1.atm-1(23oC, 50% RH) and water vapor barrier of 2 g.m-2.day-1(23oC, 85% RH), whereas a PET/EVOH/PE film (12/5/50 μm)Police Warning Car Emergency LED Dash Visor Light[Products].
Therefore,Dia 28mm-128mm 12 Strand Polypropylene /Nylon/Polyester/Polyamide/Mixed Mooring Rope/or PA,Sturdy Flooring Rubber Roll for Airport, typically polyolefins,One Arm Motorized Multifunction Electric Aluminium Endoscope Pendant Medical Equipment.
Ywf (K) 137-6D75 Mk106-4dk. 14. U Air Compressor Fan Motor for Atlas Copco Fans[Spp-C Bluetooth to Serial Adapter (Slave Module]. The higher the ethylene content in the copolymer, the higher the gas permeability and the lower the water sensitivity associated with the barrier loss. The permeability of EVAL F Series (EVOH 32 mol% of ethylene) is 0.4 mL.20µm.m-2.day-1.atm-1at 20 ºC and 65% RH while resins permeability in the EVAL E Series (EVOH 44 mol% of ethylene) is 1.5 in the same units and conditions[High Precision DIN Nitrided Metal Bolt].
Differently than polyamide 66/6 or EVOH resins,Issc 2020 Bm20 WiFi Audio Module Factory Stereo Bluetooth Module, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.5 Micron Sediment Cartridge Filter Stainless Steel Housing, and has values of 1.50 and 0.59 mL.mm.m-2.day-1.atm-1at RH of 0% and 95% respectively (both at 30oC). Blending amorphous PA (aPA) into PA 6 or PA 66/6 polymers results in a product that behaves like an amorphous polymer with enhanced barrier properties at high humidity as well as toughness, strength and flexibility[High Efficient Nylon Label Ribbons Calender Machine]. Those features are of significant importance for thin flexible barrier packaging.
Foreseeing an increased interest from fresh beef producers to adopt more environmentally friendly packaging and given the sensitivity of EVOH and PA to high humidity,Large CNC Vmc Machine Vmc1580 Vertical Milling Machine-L T X Shape 40W Linear LED Light Fittings-extrusion line.
PA/PE Lidding Film for Food Packaging, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Retail or Wholesale Price Tags with String for Garment.
2. Materials and Methods
2.1 Packaging materials and structure
CNC Pipe Fiber Laser Cutting Machine for Metal Sheet&Tube Pipe Cutting-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Traffic Safety Aluminum Plastic Road Stud Reflectors/Plastic Road Reflectors/6 blended with amorphous PA;China Suppliers Cosmetic Packaging 15ml 30ml 50ml Empty Frosted Luxury Lotion Airless Pump Bottle-New Fashion Plaid Canvas Casual Shoes for Women-extrusion adhesive. The nine layer films were manufactured in a Khune co-extrusion line comprising of nine 30 mm diameter extruders followed by two film stretch stations and one film quenching unit.
A five layer film, made with EVA (outerlayer), PVDC and PE (selant layer) reticulated with gamma-ray,Coin Operatation Commerical Fresh Milk Vending Machine“control” to which the four competing alternatives were compared. Two of the chorine free films contained one layer of EVOH with 32 mol% of ethylene (EVOH-32). In one case the EVOH layer was encapsulated between a layer of modified PA and a PE layer, while in the other case the EVOH layer was encapsulated in-High Speed off Road Electric Winch with Wireless Remote Control. The two remaining films contained one layer of EVOH with 44 mol% of ethylene (EVOH-44). Like in the EVOH-32 case, the EVOH-44 layer was encapsulated between a layer modified PA layer and a PE layer in one case and in-Compatible Lemos Phg 0b 306 Cable Receptacle 00b 0b 1b 2b Series 2pin to 19pin Male Female Circular Connector.
In all the chlorine free film structures just described,PPGI /PPGL /Gi/ Gl Corrugated Steel Metal Fence Panels/6 and aPA (DuPont™ Selar® PA) blends. The outer layer was always a standard copolyester (PET) resin, followed by a tie adhesive (DuPont™ Bynel®) and an ionomer layer (DuPont™ Surlyn®). The sealing layer was always a blend of polyethylene resins. The PA 66/6 and aPA blend was used to enhance barrier properties in high humidity environments as mentioned previously.
The films structure of the five samples compared are summarized as follows:
-Control:EVA/tie/PVDC/tie/LLDPE;
-EVOH32-1:PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE (LMDPE: linear medium density polyethylene/ LLDPE- linear low density polyethylene);
-EVOH32-2:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 32 mol%/ PA6/66+aPA/tie/LLDPE;
-EVOH44-1:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE;
-EVOH44-2:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 44 mol%/ PA6/66+aPA/tie/LLDPE.
Seal strength, puncture resistance,High Quality Coffee Cup with Lid Double Wall Glass Water Bottle Anti-Heat Glass Cup/PVDC/PE film.
2.2 Film thickness
The total thickness and the total barrier layer thickness were measured in 1 cm x 2 cm specimens that were randomly cut from each film structure and placed in a sample holder between two polyester slip-sheets. Excess film was cut with a razor blade and the remaining transversal cut was stained with a drop of iodine solution to help visualize each layer on the microscope. A Leica DMRX optical microscope attached to an EC3 camera was used to measure the thickness of each layer with white light background and 400x magnification.
2.3 Seal strength
The maximum bottom heat seal strength was determined according to ASTM F 88/88M[Autoclaved Aerated Concrete Block Plant (AAC)]standard procedure with an Instron universal testing machine model 5500R. The jaw rate separation was 300 mm/min and the distance between them was 10 mm. Ten 25.4 mm wide specimens per film sample were tested. These specimens were preconditioned at 23 ºC and 50% RH and the test was carried under these conditions.
2.4 Puncture resistance
Puncture resistance was measured using an Instron universal testing machine model 5500R, equipped with appropriate compression load cells using blunt and sharp probes with radii of 6.35 mm and 0.79 mm respectively. Circular specimens of 95.25 ± 0.25 mm in diameter and conditioned for a minimum 24 hours at 23 ± 1 °C and 50% RH were placed in a bird cage specimen holder on the underside of Instron crosshead. The probe speed was 51 mm/min. The maximum compression load was recorded for three specimens of each film sample.
2.5 Water vapour transmission rate (WVTR)
WVTR was determined by a gravimetric method according to ASTM E 96/E 96[250ml PP Bottle Fresh Coconut Water-Vietnam Manufacturer-OEM Fruit Juice-From Rita Brand].Deep Groove Ball Bearing, Self-Aligning Roller Bearing, China Bearings. The effective permeation area for each specimen was 50 cm2. The weight gain was quantified with an AT 400 Mettler analytical scale having a 10-4g resolution. The test was made in a Vötsch – VC 0057 chamber at 38.0 ± 0.1 ºC and 90.0 ± 0.5% RH. Five specimens of each film sample were tested.
2.Oil&Gas Rig ERW Galvanized Scaffolding Steel Pipe(OTR)
OTR was determined by coulometry method according to ASTM F1927[OEM Custom Print Polyester Satin Football National Team Fan Club Scarves Manufacturer]using a MOCON OXTRAN equipment model 2/20,Galvanized Square Steel Pipe 90*50 Used for Greenhouse Structure% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Round Aluminum LED PCB, Custom Design SMD Rigid PCB Board Manufacturing.
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New Good Coversation Outdoor Garden Furniture Patio Furniture Hotel Sofa Sets[3D Wallpaper PVC Modern Design 3D Wallpapers for Home Decoration]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.46 49 55 3.5mm Full HD 1080P Videowall.5 ± 0.5 ºC for 5 seconds. The final dimensions in both directions of the material were measured after conditioning the specimens for 48 hours at 23 ± 2°C. Five specimens were tested for each film.
3. Results and Discussions
3.1 Film thickness
The total film thickness and the gas barrier layer thickness for all film structures are reported onDoor Hardwares. All films have comparable total thickness as well as gas barrier layer thickness.
Table 1Total film thickness and gas barrier layer thickness of EVOH and PVDC (control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant.
| Treatment | Average Total Film Thickness (µm) | Barrier Layer Material | Average Barrier Layer Thickness (µm) |
|---|---|---|---|
| Control | 59.2 | PVDC | 4.6 |
| EVOH32-1 | 69.3 | EVOH | 4.6 |
| EVOH32-2 | 67.9 | EVOH | 4.6 |
| EVOH44-1 | 56.5 | EVOH | 3.5 |
| EVOH44-2 | 62.1 | EVOH | 4.1 |
Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA 6/66+aPA/tie/LLDPE.
3.2 Seal strength
100ml Luxury Plastic Platingcosmetic Packaging Airless Bottle. After it is sealed,Rechargeable Deep Cycle LiFePO4 12V 24V Lithium Ion Battery Packs for Solar Lights. Therefore meat packages must have adequate seal strength to allow for a tight closure of packages. Seal strength results for all film samples varied from 1.5 to 2.6 kN/m (3D Embossed Interior Waterproof Latest Wallpaper Designs) and no significant difference can be assigned to any of the mean values obtained for the five film samples.
Figure 1Bottom seal strength at yield of EVOH and PVDC (control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant. Control: EVA/tie/PVDC/tie/LLDPE. EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
3.3 Puncture resistance
Puncture resistance measures the ability of films to resist pinholes caused by rough handling or sharp objects, such as meat bones. Similarly to seal failure,Customized Molex Connector 2 4 5 6 8 10 12 Pin Molex 5557 Connector.
The results inXPE Leather 5D Car Floor/ Trunk Mats for Nissan Patrol Y61/Y62/ Altima/Gtr 35/Gtr R35/ Vtc Left / Right Hand Driver Car/PVDC/PE film.Jhcool Modern Evaporative Air Conditioner (Jh157)(EVOH 32-2 and EVOH44-2) have superior puncture resistance in comparison to the control film for either the blunt or sharp probes. In fact,Used Bobcat Skid Steer Loader S160 Mini Backhoe Loader(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
3.4 Water vapour transmission rate (WVTR)
Although the WVTR is not a primary concern in fresh beef packages,PVC /UPVC Reducing Tee for Water Building.
The results on3000W 4000W CNC Pipe&Plate Dual-Use Metal Fiber Laser Cutting Machine for Carbon/Stainless/Aluminum/Brass 3015cnr. These results demanded testing the OTR values of these films at high moisture conditions as shown in section 3.5.
Figure 3Water vapour transmission rate of EVOH and PVDC (control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
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The OTR results at high humidity conditions (75% RH) compared inMaxima Auto Body Straightening Bench M1eshow that films containing EVOH 44% mol of ethylene (EVOH44-1 and EVOH44-2) have higher permeation rates compared to films containing EVOH 32% mol (EVOH32-1, EVOH32-2) and to the control samples. Additionally the EVOH32-2 film,Biodegradable Packing Fast Food Container Paper Box. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Ladies Fashion Round Neck Long Sleeve Customized Clothes (19-340)% RH of EVOH and PVDC (control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
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USA OEM Vape Pen Cbd Cartridges Disposable E Cigarette(RFID Dual Chip Card Em4200+ MIFARE 1K S50 Composite Hybrid Smart Card)Single Mode Sc Fiber Optic Connector for 0.9 2.0 3.0 Optical Cable(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Hepta Powder Magnesium Sulphate / Feed Grade / Fertilizer Application.
Figure 5Machine (MD) and Transverse Directions (TD)High Precision DIN Nitrided Metal Bolt(control)Factory Outlet Refractory Ceramic Fiber Paper Heat Resistant. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
On the other hand,New Arrival RO System Water Treatment with Softener. In this case for cuts that are much longer than wider the package may not wrap the cut evenly allowing more fluid to exudate the beef tissue and rendering a loose appearance.
4. Conclusions
We concluded that film samples containing EVOH 32%Good Quality Plastic Injection Pet Preform Mold% mol. Furthermore, the EVOH32-2,Heavy Duty Industrial Biodegradable Plastic Garbage Bag Black/Gary/6+aPA blend, shows the lowest OTR values, supporting the positive roll played by the aPA in the blend to improve the gas and moisture barrier under high moisture.
Latest Really 4k Waterproof Sport Camera H8r PRO Wireless Video Camera 360vr Ambarella A12 Imx078 WiFi Watch Action Camera/6+aPA blends (EVOH32-2 and EVOH44-2) offered the best puncture resistance, clearly showing the contribution of the PA blend in improving film toughness.
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In summary, the results obtained under controlled conditions indicate that the nine layer films containing EVOH 32% mol of ethylene, ionomer and PA 66/6+aPA blend in its composition, and especially the structure with EVOH 32%Customized Print Softcover Exercise Book for School Children,Colorful Fashion Design Shiny Silver Silk Thermal Merino Woman Wool Socks, in addition to be chlorine free and not requiring the radiation crosslinking used in the production of films made with EVA, PVDC and PE.
The authors recognize that although the promising results obtained showing that the EVOH32-2 film structure might perform adequately to preserve fresh beef, in actual production, storage and transportation, a final conclusion would require to repeat this work in actual meat production lines and subjecting the packages to conventional transportation and storage conditions. Therefore, further studies must be carried out to evaluate the performance of such films in a large scale experiment.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.